Arellano Weather Records (MXN00001062)
Record envelope, standing records and threshold days for Arellano (MXN00001062), Mexico, with 65 years of record.
Key Facts for Arellano
- Arellano (MXN00001062) is a weather station in Mexico at 21.80 latitude and -102.27 longitude, 1,911 m (6,268 ft) above sea level.
- The station reports from 1949 to 2013, 65 years of record.
- 1,464 records set at Arellano still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Arellano set a daily record precipitation of 22.4 mm (0.9 in) on 23 September 2013.
About the Station
- Location: Mexico, 21.80 latitude, -102.27 longitude.
- Elevation: 1,911 m (6,268 ft).
- Period of record: 1949 to 2013, 65 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 35.6 C (96.1 F) | -9.4 C (15.1 F) | n/a | n/a |
| Feb | 32.8 C (91.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Mar | 35.6 C (96.1 F) | -3.3 C (26.1 F) | n/a | n/a |
| Apr | 37.8 C (100.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| May | 38.9 C (102.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Jun | 41.7 C (107.1 F) | 3.9 C (39.0 F) | n/a | n/a |
| Jul | 35.6 C (96.1 F) | 3.9 C (39.0 F) | n/a | n/a |
| Aug | 35.6 C (96.1 F) | 4.4 C (39.9 F) | n/a | n/a |
| Sep | 33.9 C (93.0 F) | 1.1 C (34.0 F) | n/a | n/a |
| Oct | 33.9 C (93.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Nov | 31.7 C (89.1 F) | -4.4 C (24.1 F) | n/a | n/a |
| Dec | 30.6 C (87.1 F) | -4.4 C (24.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 8 |
| 1950 | 22 |
| 1951 | 37 |
| 1952 | 27 |
| 1953 | 31 |
| 1954 | 21 |
| 1955 | 24 |
| 1956 | 60 |
| 1979 | 10 |
| 1980 | 16 |
| 1981 | 24 |
| 1982 | 13 |
| 1983 | 28 |
| 1984 | 28 |
| 1985 | 14 |
| 1986 | 12 |
| 1987 | 18 |
| 1988 | 13 |
| 1989 | 32 |
| 1990 | 18 |
| 1991 | 17 |
| 1992 | 28 |
| 1993 | 11 |
| 1994 | 2 |
| 1995 | 18 |
| 1996 | 6 |
| 1997 | 27 |
| 1998 | 66 |
| 1999 | 62 |
| 2000 | 92 |
| 2001 | 83 |
| 2002 | 67 |
| 2003 | 56 |
| 2004 | 26 |
| 2005 | 51 |
| 2006 | 104 |
| 2007 | 33 |
| 2008 | 74 |
| 2009 | 30 |
| 2010 | 9 |
| 2011 | 69 |
| 2012 | 70 |
| 2013 | 7 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 2002-06-05 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 2002-06-07 | Record high maximum temperature | Record high maximum temperature 41.7 C (107.1 F) |
| 2005-05-28 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 2005-08-20 | Record high minimum temperature | Record high minimum temperature 20.6 C (69.1 F) |
| 2006-05-11 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
Wettest Day of Each Month
Jul: 70.9 mm (2.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 34.3 mm (1.4 in) | 1 January 2013 |
| Feb | 45.0 mm (1.8 in) | 1 February 2010 |
| Mar | 24.4 mm (1.0 in) | 2 March 2001 |
| Apr | 53.8 mm (2.1 in) | 25 April 2001 |
| May | 67.8 mm (2.7 in) | 20 May 2009 |
| Jun | 58.9 mm (2.3 in) | 15 June 1953 |
| Jul | 70.9 mm (2.8 in) | 29 July 1988 |
| Aug | 45.0 mm (1.8 in) | 29 August 1997 |
| Sep | 45.0 mm (1.8 in) | 25 September 1992 |
| Oct | 59.9 mm (2.4 in) | 9 October 1992 |
| Nov | 22.9 mm (0.9 in) | 13 November 1992 |
| Dec | 38.4 mm (1.5 in) | 10 December 1953 |
Period of Record Coverage
1949 to 2013| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 211 | 58% | No |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 317 | 87% | No |
| 1956 | 265 | 72% | No |
| 1979 | 111 | 30% | No |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 336 | 92% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 362 | 99% | Yes |
| 2011 | 334 | 92% | Yes |
| 2012 | 360 | 98% | Yes |
| 2013 | 294 | 81% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 23 September 2013 | Arellano, MX | daily rain | 22.4 mm (0.9 in) | 7.9 mm (0.31 in) | 62 years | 20 of 100 (Routine) |
| 21 September 2013 | Arellano, MX | daily rain | 22.4 mm (0.9 in) | 5.6 mm (0.22 in) | 27 years | 20 of 100 (Routine) |
| 8 August 2013 | Arellano, MX | daily high max | 31.7 C (89.1 F) | 1.1 C (2.0 F) | 60 years | 28 of 100 (Routine) |
| 3 August 2013 | Arellano, MX | daily high max | 30.6 C (87.1 F) | 0.6 C (1.1 F) | 32 years | 17 of 100 (Routine) |
| 25 July 2013 | Arellano, MX | daily high min (Tie) | 16.7 C (62.1 F) | tie | 8 years | 2 of 100 (Routine) |
| 22 July 2013 | Arellano, MX | daily rain | 22.9 mm (0.9 in) | 2.1 mm (0.08 in) | 8 years | 10 of 100 (Routine) |
| 18 July 2013 | Arellano, MX | daily rain | 21.3 mm (0.8 in) | 2.5 mm (0.10 in) | 20 years | 14 of 100 (Routine) |
| 14 June 2013 | Arellano, MX | daily rain | 45.5 mm (1.8 in) | 23.7 mm (0.9 in) | 12 years | 32 of 100 (Routine) |
| 14 May 2013 | Arellano, MX | daily rain | 28.4 mm (1.1 in) | 7.6 mm (0.30 in) | 4 years | 13 of 100 (Routine) |
| 12 March 2013 | Arellano, MX | daily high max (Tie) | 31.7 C (89.1 F) | tie | 10 years | 2 of 100 (Routine) |
| 6 March 2013 | Arellano, MX | daily high min (Tie) | 11.7 C (53.1 F) | tie | 14 years | 2 of 100 (Routine) |
| 3 March 2013 | Arellano, MX | daily high min (Tie) | 11.7 C (53.1 F) | tie | 63 years | 6 of 100 (Routine) |
| 2 March 2013 | Arellano, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 63 years | 6 of 100 (Routine) |
| 1 March 2013 | Arellano, MX | daily high max (Tie) | 30.6 C (87.1 F) | tie | 2 years | 1 of 100 (Routine) |
| 21 February 2013 | Arellano, MX | daily high min (Tie) | 8.9 C (48.0 F) | tie | 24 years | 3 of 100 (Routine) |
| 18 February 2013 | Arellano, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 27 years | 3 of 100 (Routine) |
| 15 February 2013 | Arellano, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 10 February 2013 | Arellano, MX | daily high min (Tie) | 10.0 C (50.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 9 February 2013 | Arellano, MX | daily high max (Tie) | 30.0 C (86.0 F) | tie | 1 year | 1 of 100 (Routine) |
| 8 February 2013 | Arellano, MX | daily high max (Tie) | 28.9 C (84.0 F) | tie | 10 years | 2 of 100 (Routine) |
Climate Trend
35 complete years, 1950 to 2010| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1950 | 17.8 C | +0.55 C |
| 1951 | 17.9 C | +0.57 C |
| 1952 | 17.6 C | +0.29 C |
| 1953 | 17.5 C | +0.19 C |
| 1954 | 18.1 C | +0.85 C |
| 1980 | 17.4 C | +0.09 C |
| 1981 | 17.2 C | -0.05 C |
| 1982 | 18.0 C | +0.68 C |
| 1983 | 16.8 C | -0.49 C |
| 1984 | 16.7 C | -0.54 C |
| 1985 | 17.1 C | -0.15 C |
| 1986 | 17.5 C | +0.20 C |
| 1987 | 17.1 C | -0.19 C |
| 1989 | 17.7 C | +0.39 C |
| 1990 | 16.8 C | -0.47 C |
| 1991 | 16.8 C | -0.52 C |
| 1992 | 16.2 C | -1.07 C |
| 1993 | 16.7 C | -0.61 C |
| 1994 | 17.0 C | -0.27 C |
| 1995 | 16.7 C | -0.57 C |
| 1996 | 17.0 C | -0.24 C |
| 1997 | 16.2 C | -1.11 C |
| 1998 | 14.6 C | -2.69 C |
| 1999 | 15.9 C | -1.43 C |
| 2000 | 13.8 C | -3.46 C |
| 2001 | 14.6 C | -2.72 C |
| 2002 | 18.5 C | +1.20 C |
| 2003 | 19.3 C | +2.06 C |
| 2004 | 19.2 C | +1.92 C |
| 2005 | 19.6 C | +2.31 C |
| 2006 | 19.6 C | +2.33 C |
| 2007 | 18.2 C | +0.95 C |
| 2008 | 18.0 C | +0.72 C |
| 2009 | 18.6 C | +1.31 C |
| 2010 | 17.1 C | -0.14 C |
The fitted trend in annual mean temperature here over 1950 to 2010 is -0.02 C (-0.28 to 0.25) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.03 F (-0.51 to 0.45) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.02 C (-0.28 to 0.25) per decade | -0.03 F (-0.51 to 0.45) per decade | 1950 to 2010 | 35 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.3 to 0.2) per decade | -0.1 F (-0.5 to 0.3) per decade | 1950 to 2010 | 35 | Not clearly different from zero |
| Mean daily minimum | 0.02 C (-0.30 to 0.34) per decade | 0.04 F (-0.54 to 0.62) per decade | 1950 to 2010 | 35 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1949 to 2013| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 2002 | 35.0 C (95.0 F) | 43 |
| Coldest night (TNn) | -9.4 C (15.1 F) | 1955 | -2.2 C (28.0 F) | 43 |
| Wettest day (Rx1day) | 70.9 mm (2.8 in) | 1988 | 39.4 mm (1.6 in) | 43 |
| Wettest five days (Rx5day) | 164.1 mm (6.5 in) | 1988 | 80.3 mm (3.2 in) | 43 |
| Longest dry spell (CDD) | 159 days | 1998 | 109 days | 43 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 32.8 C (91.0 F) |
| 1950 | 37.8 C (100.0 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 35.6 C (96.1 F) |
| 1953 | 40.0 C (104.0 F) |
| 1954 | 35.0 C (95.0 F) |
| 1955 | 35.6 C (96.1 F) |
| 1956 | 35.0 C (95.0 F) |
| 1979 | 32.2 C (90.0 F) |
| 1980 | 35.6 C (96.1 F) |
| 1981 | 33.9 C (93.0 F) |
| 1982 | 35.6 C (96.1 F) |
| 1983 | 35.6 C (96.1 F) |
| 1984 | 32.8 C (91.0 F) |
| 1985 | 33.9 C (93.0 F) |
| 1986 | 35.6 C (96.1 F) |
| 1987 | 31.7 C (89.1 F) |
| 1988 | 35.0 C (95.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 35.0 C (95.0 F) |
| 1991 | 33.9 C (93.0 F) |
| 1992 | 33.9 C (93.0 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 33.9 C (93.0 F) |
| 1995 | 35.0 C (95.0 F) |
| 1996 | 33.9 C (93.0 F) |
| 1997 | 32.8 C (91.0 F) |
| 1998 | 33.9 C (93.0 F) |
| 1999 | 33.3 C (91.9 F) |
| 2000 | 31.7 C (89.1 F) |
| 2001 | 32.8 C (91.0 F) |
| 2002 | 41.7 C (107.1 F) |
| 2003 | 38.9 C (102.0 F) |
| 2004 | 36.7 C (98.1 F) |
| 2005 | 38.9 C (102.0 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 35.0 C (95.0 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 35.0 C (95.0 F) |
| 2011 | 35.6 C (96.1 F) |
| 2012 | 35.6 C (96.1 F) |
| 2013 | 35.6 C (96.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -2.2 C (28.0 F) |
| 1950 | -3.3 C (26.1 F) |
| 1951 | -5.0 C (23.0 F) |
| 1952 | -4.4 C (24.1 F) |
| 1953 | -3.9 C (25.0 F) |
| 1954 | -4.4 C (24.1 F) |
| 1955 | -9.4 C (15.1 F) |
| 1956 | -6.1 C (21.0 F) |
| 1979 | -3.3 C (26.1 F) |
| 1980 | 0.0 C (32.0 F) |
| 1981 | -4.4 C (24.1 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | -3.3 C (26.1 F) |
| 1984 | -1.1 C (30.0 F) |
| 1985 | 0.6 C (33.1 F) |
| 1986 | -2.2 C (28.0 F) |
| 1987 | -2.2 C (28.0 F) |
| 1988 | -2.2 C (28.0 F) |
| 1989 | -1.1 C (30.0 F) |
| 1990 | 0.0 C (32.0 F) |
| 1991 | -1.1 C (30.0 F) |
| 1992 | -1.1 C (30.0 F) |
| 1993 | 0.6 C (33.1 F) |
| 1994 | -2.2 C (28.0 F) |
| 1995 | -5.0 C (23.0 F) |
| 1996 | -2.2 C (28.0 F) |
| 1997 | 0.0 C (32.0 F) |
| 1998 | -4.4 C (24.1 F) |
| 1999 | -3.3 C (26.1 F) |
| 2000 | -4.4 C (24.1 F) |
| 2001 | -6.1 C (21.0 F) |
| 2002 | -2.2 C (28.0 F) |
| 2003 | -3.3 C (26.1 F) |
| 2004 | 0.6 C (33.1 F) |
| 2005 | -1.1 C (30.0 F) |
| 2006 | -6.1 C (21.0 F) |
| 2007 | 0.0 C (32.0 F) |
| 2008 | -4.4 C (24.1 F) |
| 2009 | 0.6 C (33.1 F) |
| 2010 | 0.6 C (33.1 F) |
| 2011 | -4.4 C (24.1 F) |
| 2012 | 2.8 C (37.0 F) |
| 2013 | 1.7 C (35.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 25.9 mm (1.0 in) |
| 1950 | 30.0 mm (1.2 in) |
| 1951 | 39.9 mm (1.6 in) |
| 1952 | 31.8 mm (1.3 in) |
| 1953 | 58.9 mm (2.3 in) |
| 1954 | 41.1 mm (1.6 in) |
| 1955 | 34.8 mm (1.4 in) |
| 1956 | 33.8 mm (1.3 in) |
| 1979 | 20.8 mm (0.8 in) |
| 1980 | 21.8 mm (0.9 in) |
| 1981 | 24.4 mm (1.0 in) |
| 1982 | 33.8 mm (1.3 in) |
| 1983 | 52.8 mm (2.1 in) |
| 1984 | 39.9 mm (1.6 in) |
| 1985 | 53.8 mm (2.1 in) |
| 1986 | 30.0 mm (1.2 in) |
| 1987 | 37.8 mm (1.5 in) |
| 1988 | 70.9 mm (2.8 in) |
| 1989 | 20.8 mm (0.8 in) |
| 1990 | 27.9 mm (1.1 in) |
| 1991 | 23.4 mm (0.9 in) |
| 1992 | 59.9 mm (2.4 in) |
| 1993 | 43.9 mm (1.7 in) |
| 1994 | 31.0 mm (1.2 in) |
| 1995 | 40.4 mm (1.6 in) |
| 1996 | 32.8 mm (1.3 in) |
| 1997 | 45.0 mm (1.8 in) |
| 1998 | 47.0 mm (1.9 in) |
| 1999 | 30.0 mm (1.2 in) |
| 2000 | 34.8 mm (1.4 in) |
| 2001 | 53.8 mm (2.1 in) |
| 2002 | 40.4 mm (1.6 in) |
| 2003 | 48.3 mm (1.9 in) |
| 2004 | 47.0 mm (1.9 in) |
| 2005 | 26.4 mm (1.0 in) |
| 2006 | 47.8 mm (1.9 in) |
| 2007 | 50.3 mm (2.0 in) |
| 2008 | 36.3 mm (1.4 in) |
| 2009 | 67.8 mm (2.7 in) |
| 2010 | 45.0 mm (1.8 in) |
| 2011 | 26.4 mm (1.0 in) |
| 2012 | 39.4 mm (1.6 in) |
| 2013 | 45.5 mm (1.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 46.8 mm (1.8 in) |
| 1950 | 87.7 mm (3.5 in) |
| 1951 | 66.2 mm (2.6 in) |
| 1952 | 79.3 mm (3.1 in) |
| 1953 | 97.3 mm (3.8 in) |
| 1954 | 69.3 mm (2.7 in) |
| 1955 | 81.6 mm (3.2 in) |
| 1956 | 66.0 mm (2.6 in) |
| 1979 | 43.4 mm (1.7 in) |
| 1980 | 67.3 mm (2.6 in) |
| 1981 | 46.7 mm (1.8 in) |
| 1982 | 80.3 mm (3.2 in) |
| 1983 | 109.5 mm (4.3 in) |
| 1984 | 76.5 mm (3.0 in) |
| 1985 | 79.4 mm (3.1 in) |
| 1986 | 119.6 mm (4.7 in) |
| 1987 | 79.2 mm (3.1 in) |
| 1988 | 164.1 mm (6.5 in) |
| 1989 | 64.0 mm (2.5 in) |
| 1990 | 95.7 mm (3.8 in) |
| 1991 | 90.6 mm (3.6 in) |
| 1992 | 112.5 mm (4.4 in) |
| 1993 | 80.0 mm (3.1 in) |
| 1994 | 63.5 mm (2.5 in) |
| 1995 | 102.4 mm (4.0 in) |
| 1996 | 96.0 mm (3.8 in) |
| 1997 | 88.3 mm (3.5 in) |
| 1998 | 70.3 mm (2.8 in) |
| 1999 | 67.8 mm (2.7 in) |
| 2000 | 83.6 mm (3.3 in) |
| 2001 | 65.9 mm (2.6 in) |
| 2002 | 106.2 mm (4.2 in) |
| 2003 | 141.6 mm (5.6 in) |
| 2004 | 98.4 mm (3.9 in) |
| 2005 | 54.9 mm (2.2 in) |
| 2006 | 96.9 mm (3.8 in) |
| 2007 | 121.7 mm (4.8 in) |
| 2008 | 146.6 mm (5.8 in) |
| 2009 | 133.1 mm (5.2 in) |
| 2010 | 146.2 mm (5.8 in) |
| 2011 | 53.4 mm (2.1 in) |
| 2012 | 76.7 mm (3.0 in) |
| 2013 | 71.2 mm (2.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 69 days |
| 1950 | 109 days |
| 1951 | 75 days |
| 1952 | 109 days |
| 1953 | 83 days |
| 1954 | 128 days |
| 1955 | 153 days |
| 1956 | 55 days |
| 1979 | 59 days |
| 1980 | 66 days |
| 1981 | 36 days |
| 1982 | 109 days |
| 1983 | 127 days |
| 1984 | 88 days |
| 1985 | 59 days |
| 1986 | 114 days |
| 1987 | 93 days |
| 1988 | 66 days |
| 1989 | 130 days |
| 1990 | 69 days |
| 1991 | 123 days |
| 1992 | 61 days |
| 1993 | 82 days |
| 1994 | 87 days |
| 1995 | 86 days |
| 1996 | 123 days |
| 1997 | 50 days |
| 1998 | 159 days |
| 1999 | 144 days |
| 2000 | 146 days |
| 2001 | 76 days |
| 2002 | 120 days |
| 2003 | 151 days |
| 2004 | 65 days |
| 2005 | 118 days |
| 2006 | 135 days |
| 2007 | 128 days |
| 2008 | 106 days |
| 2009 | 126 days |
| 2010 | 113 days |
| 2011 | 120 days |
| 2012 | 94 days |
| 2013 | 132 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
23 years with a frostAcross 23 years with a frost, the median last spring frost at Arellano falls on 21 February and the median first autumn frost on 22 November, which leaves a median of 273 days between them.
| Measure | Median, all years | Earliest period | Recent period (1950 to 2008) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 21 February | n/a | 21 February | n/a | n/a |
| First autumn frost | 22 November | n/a | 22 November | n/a | n/a |
| Growing days | 273 days | n/a | 273 days | n/a | n/a |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
38 years, 1950 to 2012A day with at least 38.9 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 76.2 mm (3.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 38.9 mm (1.5 in) | |
| 5 years | 50.4 mm (2.0 in) | |
| 10 years | 57.4 mm (2.3 in) | |
| 25 years | 65.5 mm (2.6 in) | |
| 50 years | 71.0 mm (2.8 in) | Longer than the 38 years of record |
| 100 years | 76.2 mm (3.0 in) | Longer than the 38 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 38 years of values from 1950 to 2012.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 70.9 mm (2.8 in) in 1988; 67.8 mm (2.7 in) in 2009; 59.9 mm (2.4 in) in 1992.
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Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).